DLL is a file extension that stands for "dynamic link library." It is used by iTunes to open media files or mp3 files on a computer. Asl.dll is a DLL file associated with iTunes and the iPhone. The file often causes errors once the iPhone has been jailbroken with the program Blackra1n. Typically the Blackra1n System error message reads, "The program can't start because ASL.dll is missing from your computer. Try reinstalling the program to fix this problem." and appears when the ASL.dll file has been corrupted.
Dynamic link library is a group of applications or programs that are used by software running on a computer. The app lets the software communicate with a device, such as an iPod or iPhone with the use of a DLL file, such as ASL.DLL. Some DLL files support the operation of a device and these DLL files are referred to as device drivers or just simply drivers.
How it Works
DLL files are not loaded in the computer's random access memory or RAM when the main program is loaded. When a DLL file is needed, it is loaded and run by a program. For instance, when you want to sync a new playlist onto your iPhone or iPod, a DLL file is used by iTunes to save the music onto the device. A corrupt or out-of-date ASL.dll file prevents iTunes from starting and causes an error.
You can reinstall ASL.dll for iTunes by updating the ASL.dll file. Download the current ASL.dll driver from ASLdllfix.com and save it in the Blackra1n executable file located in the Apple Application Support folder. The Apple Application Support folder can be found by going to the "Apple" folder, clicking on "Program Files," then clicking "Common Files." Restart iTunes to see if this fixes the problem.
If simply updating the ASL.dll driver for iTunes does not stop the error message, you will need to delete iTunes and all programs associated with it, then reinstall it onto your computer. Go to "Control Panel." Select "Add or Remove Programs" or "Install/Uninstall Programs." Uninstall iTunes, followed by Quicktime, Apple Software Update, Apple Mobile Device Support, Bonjour and Apple Application Support. Restart your computer and download and reinstall iTunes from Apple.com.
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